Can he marry the daughter of a woman who was breastfed by his mother?
Question A woman was breastfed by my mother twice, and the one who was breastfed alongside her was my older sister. I had not been born yet. The woman who had been breastfed by my mother got married, and she has a daughter. Is it permissible for me to marry her (the daughter)?. Answer Praise be to Allaah. If a woman breastfeeds a child, then this child becomes her child through radaa’ah (breastfeeding), and a brother through breastfeeding of all her children, whether those children were there before him or came later. Based on this, any woman who was breastfed by your mother is your sister through breastfeeding, and you are a maternal uncle to all her children. So it is haraam for you to marry her daughter, because you are her maternal uncle through breastfeeding. And the Prophet (peace and blessings of Allaah be upon him) said: “What becomes mahram (forbidden for marriage) through breastfeeding is that which become mahram through blood ties.” Narrated by al-Bukhaari, 2645...